Alfred leslie kendall



(No Model.)

A L. KENDALL. v DEVICE FOR FORMING PIN HOLES IN CAST METAL. No. 431,982. Patented July 8, 1890..

WITNESSES: I v INVENTUH) I (9 M BY ATTORNEY m5 mums runs 50 puovmuma. WASHINGTON, a. c

' UNITED STATES PATENT ()FFICE.

ALFRED LESLIE KENDALL, OF BROOK LYN, ASSIGNOR TO \VILLIAM STANLEY, OF NEYV YORK, N. Y.

DEVICEFOR FORMING PIN-HOLES IN CAST METAL.

SPECIFICATION forming part of Letters Patent No. 431,982, dated July 8, 1890. Application filed September 1, 1887- Serial No. 248,440- (No model.)

To all whom it may concern:

Be it known that I, ALFRED LESLIE KEN- DALL,a citizen of the United States, residing in the city of Brooklymin the county of Kings and State of New York, have invented certain new and useful Improvements in Devices for Forming Pin-lloles in Cast-Metal Knuckles, of which the following is a full and exact "specification. to My invention relates especially to the formation of the hinge-pin holes in cast-iron knuckles, such as those upon the doors and door-frames of stoves. It is well known to those skilled in the art that in molding such a casting the pattern hinge-knuckle lies almost entirely within the sand of the nowel or lower half of the flask, and the pin-hole is placed at a point in the knuckle which, when the casting is in the mold, is below the plane of parting of the two parts of the flask, or,in other words, is below the surface of the sand of the nowel, and it is therefore impossible to use for the formation of the pin-hole a core lying on the line of division between the nowel or drag part of the flask and the cope. For this reason such hinge knuckles have heretofore been cast solid and the hinge-pin holes have been formed byboring, and though numerous attempts have been made to cast the hinge-knuckles with the pin-holes ready formed therein no practicable means of supporting a suitable core for a hinge-pin hole within the mold and below the surface of the sand of the nowel or drag has heretofore been 3 5 devised. To supply this and thus provide for the formation of the hinge-pin hole in the process of casting is the object of my invention. This object I accomplish in the following manner: On each side of the pattern 40 hinge-knuckle is formed a projection having preferably a triangular section with the base adjoining the pattern and extending from the upper edge of the pattern as it lies in the I mold downward about two-thirds the height 5 of the knuckle or so far as to cover the places which the ends of the pin-hole are intended to occupy in the completed knuckle. The molding-sand is tamped around the pattern in the usual manner, and on the removal of the pattern from the sand the projections on the hingeknuckle of the pattern leave a groove in the sand of the nowel on each side of the hollowleft by the hinge-knuckle. Into these grooves are then slipped side pieces or supports, which are of the same shape and dimensions as the projections on the pattern hinge-knuckle and therefore exactly fill the grooves, and have their exposed surfaces flush with the surface of the sand of the nowel, and which carry between them the core for forming the pin-hole in the hingeknuckle. These side pieces or supports and the core are made in one piece, and are composed of hardened pipe-clay, molders coresand, or other material which will not affect or be affected by the metal in casting and which can be broken or driven out of the pinhole after the casting is completed. The core should be of the same shape and size which the, completed pin-hole is to have. The filing of the pinholes in the hinge-knuckles of stovedoors, which has heretofore been necessary in order to give to the hinge-pins the play needed for the unlatching of the door, may be obviated by giving to the core at those points where the pin-hole is usually filed a diameter slightly larger than that of the hinge-pin to be used, thus securing space in the pin-hole for a lateral movement of the hinge-pin without the labor of filing. After the side pieces and core are put in position the cope is re turned to its place upon the nowel and the casting is completed in the usual manner. The side pieces or supports of the core resting in the grooves in the sand hold the core firmly in position, so that it will not be moved by the incoming of the molten metal. After the casting is removed from the mold the core may be easily punched out, leaving the hingepin hole complete. 0

It will be evident from the foregoing de scriptionthat the pin-hole may be located in any desired part of the hinge-knuckle, and that an indefinite number of castings may be made, in all of which the pin-holes will 00- cupy exactly the same relative position. The projections upon the sides of the pattern hinge-knuckle may be made integral therewith, which I prefer, or they may be attachedthereto by means of pins or otherwise-as, for too example, in case it is desired to use an old pattern made without them.

The invention is illustrated in the drawings, in which the same letters of reference indicate corresponding parts in the different figures.

Figure 1 shows a sectional elevation of the pattern in the mold on the line 2 2 in Fig. 3. Fig. 2 is aplan View of the same. Fig. 3 shows a section of the mold after the withdrawal of the pattern on the line at 4: in Fig. 5. Fig. 4 is a plan View of the same. Fig. 5 is a section of the mold, after the withdrawal of the pattern, on the line 6 6 in Fig. 4. Fig. 6 is a sectional View of the hinge-knuckle casting in the mold on the line 7 7 in Fig. 9, showing the core and its supports. Fig. 7 is a perspective View of the core and its supports. Fig. 8 is a sectional view of the mold and the casting therein on the line 9 9 in Fig. 7.

In the drawings, A represents a stove-door pattern having a hinge-knuckle B, which, when the door is cast, is to have a pin-hole to receive the hinge-pin for holding the door in position. b b are wings or projections attached to each side of the pattern hinge-knuckle.

G is the hollow left in the mold by the pattern hinge-knuckle B on its Withdrawal, and c c are grooves or depressions made in the sand of the mold on each side of the hollow C by the wings or projections 11 b.

D is the hinge-knuckle after casting, and (Z is the pin-hole therein.

E is the core for forming the pin-hole in the hinge-knuckle, and e e are supports therefor, corresponding exactly in shape and size to the wings or projections 12 b on the hingeknuckle pattern B. These wings or projections may be made integral with the pattern or they may be separate pieces attached thereto. I do not limit myself as to their shape,but prefer to make them with a triangular section. They are so located upon the I pattern that when the core-supports e e, which correspond exactly in shape and size to the projections b b, are placed in the grooves c 0, formed in the mold by the projections, the upper ends of the supports 6 6 will be flush with the upper surface of the sand of the nowel and the core E will occupy the position which the pin-hole is to occupy in the completed casting.

Upon removing the cope and withdrawing the pattern from the mold the grooves c c are formed by the wings 19-?) in the sides of the hollow 0 left by the hinge-knuckle B. The supports 6 e, carrying the core E, are then slipped into the grooves c 0, so that the core E extends across the hollow G from side to side and is held firmly in position by means of the supports 6 c, resting in the grooves c c.

The core E and its supports 6 e are made of baked pipe-clay, molders core-sand, or other material which will not affect or be affected by the molten metal in the process of casting and which can be driven out of the hole after the casting is completed. After the supports 6 e and the core E are in position the cope is returned to its place upon the nowel and the casting is completed in the usual manner. After removing the casting from the mold the supports 6 e are broken off and the core E is punched out of the pin-hole. In illustrating my invention I have shown it as applied to the production of a perforated door-hinge knuckle. It is evident, however, that the pin holes in the coacting hinge-knuckles upon the door-frame will be formed in the same manner, as may also pin holes or perforations in any similar cast metal knuckles or projections.

My invention not only materially reduces the costof forming pin-holes in cast-iron hinge-knuckles, but at the same time it en-' ables the pin-holes to be located with an exactness and uniformity hitherto unattainable, so that a stove-door may with equal convenience and without filing out the pin-holes be applied successively to any number of doorframes, and, on the other hand, a door-frame will receive any one of a number of doors without having them specially fitted thereto.

I am aware that heretofore cores have been used for forming perforations in castings extending across the hollow in the mold on the line of separation between the two parts of the flask. It is not possible, however, to accomplish the object of my invention by means of such a core, and I do not claim such herein.

What I claim as new, and desire to secure by Letters Patent. is-

1. As a means of supporting a pin-hole core in the mold at a point below the plane of division between the two parts of the flask, the combination of grooves or depressions formed in the sides of the mold, and core-supports extending downward from said plane of division at right angles thereto, corresponding in shape and size to said grooves or depressions and resting directly therein, the exposed surfaces of said core-supports being flush with the surface of the sand of the nowel.

2. As a means of supporting a pin-hole core in the mold at a point below the plane of division between the two parts of the flask, the combination of grooves or depressions formed in the sides of the mold, and core-supports extending downwardly from said plane of di vision at right angles thereto, said core-supports being made integral with the core and resting in the grooves or depressions with which they correspond in shape and size, the exposed surfaces of said core-supports being flush with the surface of the sand in the nowel.

3. As a means of forming pin-holes in castmetal knuckles or projections in the process of casting at a point below. the plane of division between the two parts of the flask, the combination of a core, side pieces or supports made integral therewith extending downward from said plane of divisionand at right angles thereto, and grooves or depressions for to to hold the core suspended in the mold at it point below the surfaee of the sand in the mold.

In testimony whereofI have hereunto subscribed my name this 30th day of August, A. D. 1887.

A. LESLIE KENDALL.

Witnesses:

A. J. KENDALL, WILLIAM W. BUCKLEY. 

